Memory

All data sheets are subject to change without notice

(858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com

12-Bit A/D Converter

7672

08.09.02 Rev 13

EATURES

· 12-bit high speed A/D converter
· R

-P

® radiation-hardened against natural space radia-

tion

· Total dose hardness:

- > 100 krad (Si), depending upon space mission

· Excellent Single Event Effect

- SEL > 120 Mev/mg/cm

- SEU

> 5.8 Mev/mg/cm

- SEU

Sat

= -1E-4 cm

/Device

· Package:

- 24 pin R

-P

® flat package

- 24 pin R

-P

® DIP

· Fast conversion times:

- 7672-05: 5 µs

· Low 110 mW typical power consumption

- Corrects all single-bit errors
- Detects all double and some triple-bit errors

· High-speed BiCMOS technology

- Choice of +5V and +10V input ranges
- Operates with +5V and -12V power supplies
- Fast 125 ns bus-access time

ESCRIPTION

Maxwell Technologies

' 7672 high-speed 12-bit analog-to-

digital converter microcircuit features a greater than 100 krad

(Si) total dose tolerance, depending upon space mission. The
7672 uses an accurate high-speed DAC and comparator to
achieve conversion time as low as 5 µs while dissipating only
110 mW of power. The 7672 is designed to be used with an
external reference voltage. This allows the user to choose a
reference whose performance suits the application or to drive
multiple 7672s from a single system reference, since the refer-
ence input is buffered and draws very little current. For digital
signal processing applications where absolute accuracy and
temperature coefficients may be unimportant, a low cost refer-
ence can be used. For optimal precision, a high accuracy ref-
erence where an absolute 12-bit accuracy can be obtained
over a wide temperature range may be used. Analog input
range is pin-selectable for 0 to +5V, 0 to +10V, or ±5V, making
the ADC ideal for data acquisition and analog input/output
cards. A high-speed digital interface (125 ns data access time)
with three state data outputs is compatible with most micro-
processors.

Maxwell Technologies' patented R

-P

® packaging technol-

ogy incorporates radiation shielding in the microcircuit pack-
age. It eliminates the need for box shielding while providing
the required radiation shielding for a lifetime in orbit or space
mission. In a GEO orbit, R

-P

provides greater than 100

krad (Si) radiation dose tolerance. This product is available
with screening up to Class S.

12-BIT DAC

SUCCESSIVE APPROXIMATION

CONTROL

LOGIC

CLOCK

OSCILLATOR

12-BIT LATCH

THREE-STATE

OUTPUT DRIVERS

REF

AIN1

AIN2

BUSY

CLK OUT

CLK IN

DGND

D11

AGND

Logic Diagram

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

ABLE

1. 7672 P

INOUT

ESCRIPTION

YMBOL

ESCRIPTION

AIN1

Analog Input

REF

Voltage-Reference Input

AGND

Analog Ground

4-11

D11-D4

Three-State Data Outputs

DGND

Digital Ground

13-16

D3-D0

Three-State Data Outputs

CLKIN

Clock Input

CLKOUT

Clock Output

READ Input

CHIP SELECT

BUSY

Negative Supply, -12V

Positive Supply, +5V

AIN2

Analog Input

ABLE

2. 7672 A

BSOLUTE

AXIMUM

ATINGS

ARAMETER

YMBOL

NITS

Positive Supply Voltage to DGND

-0.3

7.0

Negative Supply Voltage to DGND

-17

+0.3c

AGND to DGND

-0.3

+0.3

AIN1, AIN2 to AGND

-15

+15

Digital Input Voltage to DGND

-0.3

+0.3

Digital Output Voltage to DGND

OUT

-0.3

+0.3

REF

to AGND

-0.3

+0.3

Power Dissipation to +75°C

1000

Power Dissipation above 75°C (Derate)

mW/°C

Thermal Impedance

3.24

°C/W

Storage Temperature Range

STG

-65

+150

°C

Operating Temperature Range

-55

+125

°C

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

ABLE

3. 7672 R

ECOMMENDED

PERATING

ONDITIONS

ARAMETER

UBGROUPS

YMBOL

NITS

Positive Supply Voltage

4.75

5.25

Negative Supply Voltage

-13.2

-10.8

REF

Input Range

REF

-5.05

-4.95

Power Dissipation V

= 5V, V

= -12V

179

ABLE

4. 7672 DC E

LECTRICAL

HARACTERISTICS

= 5V ±5%, V

= -12V ±10%, V

REF

= -5V, T

= -55

125 °C

UNLESS

OTHERWISE

SPECIFIED

)

ARAMETER

YMBOL

EST

ONDITION

UBGROUPS

NITS

Input Low Voltage

1, 2, 3

0.8

Input High Voltage

1, 2, 3

2.4

Output Low Voltage

SINK

= 1.6 mA

1, 2, 3

0.4

Output High Voltage

SOURCE

= -200 µA

1, 2, 3

4.0

Input Leakage Current

(CS,RD) V

= V

or GND

(CLKIN) V

= V

or GND

1, 2, 3

--
--

±10
±20

µA

Output Leakage Current

LKG

(D0-D11) V

OUT

= V

or GND

1, 2, 3

±10

µA

Input Capacitance

Floating State Output Capacitance

OUT

Power Supply Current

1, 2, 3

--
--

-12

Power Supply Rejection, V

PSRR (V

) V

= 4.75 to 5.25 volts

= -12V

1, 2, 3

±1

LSB

Power Supply Rejection, V

PSRR (V

) V

= -10.8 to -13.2 volts

= 5V

1, 2, 3

±1

LSB

Analog Input Current (AIN1 or AIN2)

AIN

Unipolar Range: 0 to 5 V, 10V
Bipolar Range: ±5V

1, 2, 3

--
--

±3.5

±1.75

REF

Input Range

REF

1, 2, 3

-5.05

-4.95

REF

Input Current

REF

1, 2, 3

±3

µA

Resolution RES

= -55 to +125°C

1, 2, 3

bits

Integral Nonlinearity

INL

= +25 °C

= -55 to +125°C

2, 3

--
--

±1
±1

LSB

Differential Nonlinearity

DNL

12 bits, no missing codes
T

= -55 to +125

1, 2, 3

±0.9

LSB

Unipolar Offset Error

UOE

= +25

= -55 to +125

2, 3

--
--

±5
±6

LSB

Unipolar Gain Error

UGE

= +25

= -55 to +125

2, 3

--
--

±5
±7

LSB

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

Bipolar Zero Error

BZE

= +25

= -55 to +125

2, 3

--
--

±5
±6

LSB

Bipolar Gain Error

BGE

= +25

= -55 to +125

2, 3

--
--

±5
±7

LSB

1. Guaranteed by design.

ABLE

5. 7672 T

IMING

HARACTERISTICS

1,2

= 5V ±5%, V

= -12V ±10%, V

REF

= -5V, T

= -55

125 °C

UNLESS

OTHERWISE

SPECIFIED

)

1. 1LSB = FS/4096; T

= 25

C; Performance over power supply tolerance is guaranteed by power supply rejection test.

2. All inputs are 0V to +5V swing with t

= t

= 5ns (10 to 90% of +5V) and timed from a voltage level of +1.6V.

ARAMETER

EST

ONDITION

UBGROUPS

YMBOL

NITS

Conversion Time, Synchronous Clk,

3. Functionally tested.

12.5 clks, TA = -55 to +125 °C

9, 10, 11

tCONV

5.0

Conversion Time, Asynchronous Clk,

12-13 clks, TA = -55 to +125 °C

9, 10, 11

tCONV

4.8

5.2

CS to RD Setup Time

TA = -55 to +125 °C

9, 10, 11

RD to BUSY Delay

CL = 50 pF, TA = +25 °C
CL = 50 pF, TA = -55 to +125 °C

10, 11

--
--

190
270

Data Access Time

4. t3 and t6 are measured with the load circuits of Figure 1 and are defined as the time required for an output to cross +0.8 or

+2.4.

CL = 100 pF, TA = +25 °C
CL = 100 pF, TA = -55 to +125 °C

10, 11

--
--

125
170

RD Pulse Width

TA = -55 to +125 °C

9, 10, 11

CS to RD Hold Time

TA = -55 to +125 °C

9, 10, 11

Data Setup Time After BUSY4

CL = 100 pF, TA = +25 °C
CL = 100 pF, TA = -55 to +125 °C

10, 11

--
--

100

Bus Relinguish Time

5. t7 is defined as the time required for the data lines to change 0.5V when loaded with the circuit of Figure 2.

(TA = +25 °C)
(-55 < TA < +125 °C)

10, 11

--
--

75
90

Delay Between Read Operations

(-55 < TA < +125 °C)

9, 10, 11

200

ABLE

4. 7672 DC E

LECTRICAL

HARACTERISTICS

= 5V ±5%, V

= -12V ±10%, V

REF

= -5V, T

= -55

125 °C

UNLESS

OTHERWISE

SPECIFIED

)

ARAMETER

YMBOL

EST

ONDITION

UBGROUPS

NITS

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

D24-02

Note: All dimensions in inches

24 P

-P

® D

UAL

INE

ACKAGE

YMBOL

IMENSION

0.167

0.200

0.014

0.018

0.026

0.045

0.050

0.065

0.008

0.010

0.018

1.200

1.280

0.510

0.594

0.620

0.600 BSC

eA/2

0.300 BSC

0.100 BSC

0.135

0.145

0.155

0.015

0.030

0.045

0.005

0.025

0.005

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

Important Notice:

These data sheets are created using the chip manufacturer's published specifications. Maxwell Technologies verifies
functionality by testing key parameters either by 100% testing, sample testing or characterization.

The specifications presented within these data sheets represent the latest and most accurate information available to
date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no
responsibility for the use of this information.

Maxwell Technologies' products are not authorized for use as critical components in life support devices or systems
without express written approval from Maxwell Technologies.

Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech-
nologies. Maxwell Technologies' liability shall be limited to replacement of defective parts.

Memory

All data sheets are subject to change without notice

12-Bit A/D Converter

7672

08.09.02 REV 13

Product Ordering Options

Model Number

Feature

Option Details

7672

Screening Flow

Package

Radiation Feature

Base Product
Nomenclature

Monolithic
S = Maxwell Class S
B = Maxwell Class B
I = Industrial (testing @ -55°C,
+25°C, +125°C)
E = Engineering (testing @ +25°C)

D = Dual In-line Package (DIP)
F = Flat Pack

RP = R

-P

® package

12-Bit A/D Converter

-XX

Access Time

05 = 5 us

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